The most common and most likely answer to this crossword clue is the 10 letter word PRUDENTIAL
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Buddy explains!
The straight part
We know that "Cautious" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cautious = prudential.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does PRUDENTIAL mean?
PRUDENTIAL noun- (chiefly in the plural) A matter requiring prudence.
- Characterised by the use of prudence; arising from careful thought or deliberation.
- Of a person: exercising prudence; cautious.
- Advisory; superintending or executive.